I'm not a graphics guy, so I'm sure someone else would have better ideas.... Until then, how about taking a screen shot of the market display for ruboto core, scale it down, and stick an arrow on it.
I invited artists on the mailing list to contribute an image for the Ruboto Core platform installation prompt.
In the meantime, I added the Ruboto logo 128x128 as a standard image for the prompt. This is better than using the icon, at least. The image is 6KB. I will see if I can add an arrow to it.
If there are no other contributions before the 0.5.3 release, I will close this.
* Issue #100 Improve market prompt image
* Added Ruboto logo with a download arrow 128x128 px png
@ruboto Download arrow added to the Ruboto logo at 128x128 pixels and 19KB. If anyone can do better, please go ahead :)
After crunching by the Android SDK, the image is 8751 bytes which I think is acceptable. I hope you can verify the quality.
* Increased apk limits to allow for the new image