Anything Steins;Gate related.
Post wallpapers of Autumn. Doesn't have to have fall colors, anything that gives that vibe of cooler days (scarves/jackets/etc). Avoid anything with snow or bare trees though, that's for the Winter thread.
I'll dump some things to start off; some of these are edited and cropped, and there's a fair number of touhou images. Apologies if that's not to your taste.