I created a wallpaper some time ago under the name of 12monthsOFwinter and posted it on DeviantArt. Despite the watermark it has been downloaded almost 200, 000 times since it first went online some 4 years ago.
It consistently shows up on the first page of a
search for 'butterfly wallpaper' in search engines (partially because
it has been uploaded to various sites- usually without permission).
Since I can't go back in time or stem the tide I am uploading a new
version at DA and new versions for various devices- but with my real
name on it rather than an avatar watermark.
These are all at 100 pixels per inch at various dimensions for Blackberry, Android, Symbian, Windows, Apple etc. I'm sure there's an image that will work for most phones.