Great for old pc
This prog is great: Just 1,2 MB memory-usage, simple navigation and all the basics you need. In addition to coolicon with some really cool icons ;-) you get a fast desktop-environment. You can even use some gtk-apps since you saved memory. I use it though I got a fast computer since it looks nice if you use black and white colors. Give it a whirl ...
For those who like backdrops
This little app is all I need to browse through my pictures and set them as backgrounds. Even with the old one: All you need is to edit the open with lines with something like wmsetbg, eg wmsetbg -s will expand pictures. I prefer this since I use transparent terminals, but you can use any other.