Use Gmail as much as I do? Then here’s a simple Chrome extension that you need to install!
Attachment Icons for Gmail - Original name, eh? haha It does exactly what it says. It’ll replace the generic “paperclip” attachment icon in Gmail with a more appropriate icon. Ie. Picture files will have an image icon, pdfs will have a pdf icon etc.
Makes scanning your inbox for a type of attachment really simple!
Thanks to Lifehacker for bringing the extension to my attention!