When I peruse Etsy (which is often), I always end up scoring something awesome. Case in point: this Cassette Tape Sticker Pack ($9). I mean, I didn't know I needed vinyl cassette tape stickers that are "ever so slightly larger" than the real thing, but once I saw them, I had to have them.
But taking a cruise around the rest of Beepart's shop, I found a treasure trove of vinyl goodness that you can adhere to your walls, your laptop, even your Trapper Keeper. I've picked out some of my faves in the retro geek/robot categories below. Check them out, and I dare you to try to not click "Buy."