Here are 3 themes for your Windows computers which supports Windows 7. Windows 8 and Windows RT.
Beautiful Birds theme
It have 17 beautiful birds wallpapers
Let the grace and gorgeous plumage of swans, flamingoes, peacocks, and other exotic birds brighten your day with this free theme for Windows.
Get the Beautiful Birds Theme for windows from here
Bees theme
It have 9 Beautiful wallpapers , the photos are by Mayur Kotlikar
Get it from here
Dogs in Winter theme
Dogs in Winter theme have 14 cute beautiful dog wallpapers
The grass and foliage may have faded, but not the playful spirits of the doggies in this free theme for Windows. Enjoy them playing in leaves, running madly over the snow, chewing on stuff, and getting frost all over their whiskers.
Get it from here
If you are using a windows 7/8/RT theme can you please share them ?