Sorry if i've got the wrong idea, but it sounds like what ur asking for is this:
You want the MSN contacts list to become a part of ur desktop so u can quickly see who's online and who isnt, but u want it to blend in with ur desktop to make it more appealling.
What I dont understand is this:
If you have your contact list on your desktop, then that's going to get covered up by other programs running. Therefore ur going to have to press your Show Desktop button to be able to see your contacts list - but thats pretty much the same as just clicking the MSN Messenger taskbar button that u have now
. Also I don't think Patchou needs to add fresh ideas so often anymore as Plus! seems to be doing alright for itself with many people using it, and i dont think all of them use it to its full potential either. Just my 2 pennys worth