Take a look at what I came across over at XDA posted by kimi_sae_ireba
http://forum.xda-developers.com/showthread.php?t=605252
He has a few mods for Sense 2.1 include a Background 4 All tab
kimi_sae_ireba_sense2.1_BGMod.cab and a cab to correct weather animation after BGMod cab is installed.
The Email tab cab that was ported from Sense 2.5 is pretty cool too. I already tired that.
I am running EnergyROM_21885_HERMAN_24.Dec.2009_Standard at the moment. Wish I could find the white flip clock for this ROM though. It will come around soon enough. Lets read the forum and see what else we can find for our addiction.