A very nice kerbal planet so to say.
If you have problems to get some good earth maps, please let me help you out WAS.
Some old but very good 16K maps from Earth can be downloaded with the wayback machine under these links. The site is gone, but the links work.
I have the original CD with all these maps in 43K resolution and based upon this work, I have created a very accurate mask collection from earth.
North and south poles, water, land, ice-sheet, rivers, lakes, outlines... ect...
The reason why I recommend these old maps is, that the masks are the best you can find anywhere!
Inclusive a flat earth map to create your own elevation maps! Download them all, they're worth to download them!
Also click on sitemap, there's more for you to discover!

Screenshot Space-Graphics e43 from 2007
All 16K map links are listed here
http://web.archive.org/web/20060219172902/http://www.space-graphics.com/earth_intro.htm
Earth Shaded
http://web.archive.org/web/20060219172546/http://www.space-graphics.com/e43_shaded.htm
Earth flat
http://web.archive.org/web/20060219172328/http://www.space-graphics.com/e43_flat.htm
Bump
http://web.archive.org/web/20060219172301/http://www.space-graphics.com/e43_elevation1.htm
Masks / Style 1+2!
http://web.archive.org/web/20060315101522/http://www.space-graphics.com/e43_mask.htm
Clouds
http://web.archive.org/web/20060315102611/http://www.space-graphics.com/e43_cloud.htm
STORMLORD