Might as well share my collection with the group! A curated set of screenshots from various sources, and a bunch captured by myself to fill in the gaps.
Based on a 1G1R set with region priority of USA > Europe > Japan
All images are 160x144 PNG, native resolution, checked over for any recompression artefacts
Again, these are native resolution. If you want a solution to these being 'low resolution' screenshots that look blurry in some situations:
Batch upscale the entire set using image editing software (I recommend using XnView MP) with a non-blurry algorithm
Modify your LaunchBox or BigBox theme views so that when large images are displayed, the RenderOptions.BitmapScalingMode property is set to "NearestNeighbor" rather than "HighQuality", it'll make them look nice and sharp
Let me know if there's any issues!