I knocked up a RasPi wallpaper (using the SVG logo) in Inkscape a few weeks ago, for a RasPi-look Fluxbox theme I use on my Eee 701 netbook (see the screenshot at the blog post). I exported the image as 800x480 for the 701's display, but the Fluxbox theme centres the image and applies a matching black background, so at a higher resolution the RasPi logo would simply appear smaller.
Hopefully I'll be able to run Fluxbox under Arch on the RasPi, and see this theme as I intended it In the meantime, let me know if you'd like the wallpaper, and I'll try and attach it here (how do you do that in this forum, BTW?).
Raspberry Pi Model 3B+ (2019) ("ayeka") - CentOS
Raspberry Pi Zero W (2018) ("mass") - Raspbian
Raspberry Pi Model B (1st-gen - 2012) ("ryo-ohki") - Arch Linux ARM