More newb questions.

[DethKnight]

make sure you have the supporting classes and datatypes for the image formats you hope to use

then just plug them into the prefs/patterns settings

(large wallpapers tend to increase "boot-time")

[DethKnight]

Im using warpjpeg.datatype
and if I remember correctly I had to
update my picture.datatype

I found them on a website which must be registered to
 Mork form Ork
http://www.nanunanu.org/~oliver/

ps: I've also uploaded a proof-of-concept screenshot in the images here on amiga.org under category Workbench Screenshot

[DethKnight]

Multiview just up and quits when I try to view .JPGs with it

Don't be so certain...give it massive amounts of time to render the image. My multiview seemed to "quit" also, but I sat it out for a loooooong time, then it finally produced the image. BTW I have discovered that my favorite image format of all time (raw tiff) loads and renders way way way faster than JPG on my emulation. And this is on a P3/933.

I've determined that multiview could benefit from a "busy" indicator

[DethKnight]

also make sure you have rtg.library and uaegfx.library installed in your emulation
configure your emulation to have some RTG memory
pick a uaegfx screenmode from Prefs

I use gimp for my conversions but I will second XnView

inside the emulation you can use rend105.lha (Rend24) from aminet or grinder
Rend24 is proof that the emualtor will reproduce HAM banding and fringing