Theres a few other cool versions of the "rejuvination chamber" around.....although of course they aren't called "rejuination chambers"
You can get the Living It Up "Free the Magic" Vase from one of the Saving The Sims Yahoo Groups - I believe its made by Craze, so you might want to check groups 84 thru 90 (start here: http://games.groups.yahoo.com/group/savingthesims84/)
If your interested in the Millinium Sims Magic Mirror, I know there's an archive group someplace for their creations, I just don't recall where. Maybe either in the Sims File Share Groups or one of the Saving the Sims Groups (I think I'm wrong though).
As far as Cheap Frills goes, unfortunately the site has closed down and no one seems to be able to get ahold of the site owner to get her persmission to create an archive group for her creations.
You could also try visiting Around the Sims (http://www.aroundthesims.com) for some great mood boosters.
My friend Claudia who runs Sim Pegasus also created some wonderful Mood Boosting objects - you can find her hacked hot tub energizer (visiter enabled) here: http://au.groups.yahoo.com/group/SimsPegasus-Resource/
and her mood boosting foods here: http://au.groups.yahoo.com/group/simspegasusresource2/
As for changing the loading screen, I assume your talking about the Splash Screen? If I recall correctly, you can create your own graphics for a new one, and I'm pretty sure that you just place your bmp (ya it has to be saved as a bmp) in the UIGraphic's folder - the actual splash screen is in a far file, and simply by placing your new Splash Screen in that folder should over write the one inside the far.
I know my site partner Val, knows how to change the splash screen correctly for sure - if you'd like, you could PM her at our forum (link under my siggy) or just post a message in the forum to ask her about it.