Initial proof of concept.

bad-words.txt

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+anal
+anus
+arse
+ass
+ballsack
+balls
+bastard
+bellend
+bell end
+bitch
+biatch
+bloody
+blowjob
+blow job
+bollock
+bollok
+boner
+boob
+breast
+bugger
+bum
+butt
+buttplug
+clitoris
+cock
+coon
+crap
+cunt
+damn
+dick
+dildo
+dong
+dyke
+fag
+feck
+fellate
+fellatio
+felching
+fuck
+f u c k
+fudgepacker
+fudge packer
+flange
+gay
+goddamn
+god damn
+hell
+homo
+jerk
+jizz
+jugs
+kill
+knobend
+knob end
+labia
+lmao
+lmfao
+muff
+nigger
+nigga
+omg
+penis
+piss
+poop
+prick
+pube
+pussy
+queer
+rape
+scrotum
+sex
+shit
+s hit
+sex
+sh1t
+shlong
+slut
+smegma
+spunk
+strip
+tit
+tosser
+turd
+twat
+vagina
+wang
+wank
+whore
+wtf

proof_of_concept.py

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+#!/usr/bin/env python3
+import os
+import sys
+import shutil
+import tempfile
+
+import praw
+import requests
+from PyQt4.QtCore import Qt
+from PyQt4.QtGui import QApplication, QWidget, QPixmap, QLabel
+from PyQt4.QtGui import QGraphicsDropShadowEffect, QColor
+
+
+class ImageGetter():
+
+    def __init__(self, reddit, subreddit='earthporn', aspect_ratio=1.6):
+        self.reddit = reddit
+        self.subreddit = subreddit
+        self.aspect_ratio = aspect_ratio
+        self._seen = set()
+
+    def get_image(self, path):
+        subs = self.reddit.get_subreddit(self.subreddit).get_new(limit=50)
+        url = self._get_image_url(subs)
+        while url is None or url in self._seen:
+            url = self._get_image_url(subs)
+        self._seen.add(url)
+        response = requests.get(url, stream=True)
+        if response.status_code == 200:
+            response.raw.decode_content = True
+            with open(path, 'wb') as wfh:
+                shutil.copyfileobj(response.raw, wfh)
+
+    def _get_image_url(self, subs):
+        next_sub = next(subs)
+        images = next_sub.preview.get('images', {})
+        for image in images:
+            source = image['source']
+            image_aspect_ratio = source['width'] / source['height']
+            if abs(self.aspect_ratio - image_aspect_ratio) < 0.00001:
+                return source['url']
+
+
+class TextGetter():
+
+    def __init__(self, reddit, subreddit='showerthoughts', badlist='bad-words.txt'):
+        self.reddit = reddit
+        self.subreddit = subreddit
+        if badlist:
+            with open(badlist) as fh:
+                self.bad_words = fh.read().splitlines()
+        else:
+            self.bad_words = []
+        self._seen = set()
+
+    def get_text(self):
+        subs = self.reddit.get_subreddit(self.subreddit).get_new()
+        text = None
+        while text is None or text in self._seen or 'r/showerthoughts' in text.lower():
+            text = next(subs).title
+            lower_text = text.lower()
+            for bad in self.bad_words:
+                if bad in lower_text:
+                    text = None
+                    break
+        self._seen.add(text)
+        return text
+
+
+def show_billboard(imagepath, text, fontsize=42):
+    app = QApplication(sys.argv)
+    w = QWidget()
+    w.resize(1600, 1000)
+    w.setWindowTitle("Billboard")
+
+    pix = QPixmap(imagepath)
+
+    image_label = QLabel(w)
+    image_label.resize(1600, 1000)
+    image_label.setPixmap(pix.scaled(w.size(), Qt.KeepAspectRatio))
+
+    text_label = QLabel(w)
+    text_label.resize(1600, 1000)
+    text_label.setMargin(100)
+    text_label.setText('"{}"'.format(text))
+    text_label.setStyleSheet('''
+        QLabel {{
+                    font-size: {}pt;
+                    color: #eeeeee;
+                    text-align: center;
+                }}
+    '''.format(fontsize))
+    text_label.setWordWrap(True)
+    text_label.setAlignment(Qt.AlignCenter)
+
+    dse = QGraphicsDropShadowEffect()
+    dse.setBlurRadius(10)
+    dse.setXOffset(0)
+    dse.setYOffset(0)
+    dse.setColor(QColor(0, 0, 0, 255))
+    text_label.setGraphicsEffect(dse)
+
+    w.show()
+    app.exec_()
+
+
+def main():
+    reddit = praw.Reddit(user_agent='billboard')
+    imagegetter = ImageGetter(reddit)
+    textgetter = TextGetter(reddit)
+
+    image_path = tempfile.mktemp()
+    imagegetter.get_image(image_path)
+    text = textgetter.get_text()
+
+    show_billboard(image_path, text)
+    os.unlink(image_path)
+
+
+if __name__ == '__main__':
+    main()