I agree about the packaging looking dull and boring for the 3 3/4" figures. But I don't think it is the worst packaging. That honor goes to RotS. I hated the overly stylized art, I hated the color scheme, I hated the font, and I hated the shape of the bubble. Runner up for the worst packaging goes to the 30th Anniversary Collection. The white/gray didn't scream Star Wars to me and I hated the shape of the cards. My third least favorite would probably be this new Black Series. I don't mind it for the 6" figures though. It looks "classy" in a minimalist sort of way but it doesn't seem to fit the smaller scaled line. I stopped collecting right around the time the 30th Anniversary set came out. There might be uglier packaging I'm not aware of but from what I collected and have seen in stores, these are my picks.
Since I ranted about my least favorite packaging, I guess I'll rave about my favorites. Is there anyone who disagrees the vintage packaging is the best? The huge colorful movie still/promo shot on the card with the silver border on a black card is so classy. Those are figures that almost beg to be left in the package. Runner up goes to the Original Trilogy Collection. They had a vintage vibe with the black and silver color scheme. I liked that they had the name of which movie the character appears from, a small movie still/promo shot up front, and then an appropriate background that complements the figure. I collected that whole line and left them in their packaging. Truly an amazing collection considering so many were simple recards. My third favorite was the original cards for the PotF2 collection (1995-1996). It was a nice blend of modern stylized art that continues to plague SW packaging and the nice simplistic vintage figures with a photo of the character up front. I also have a soft spot for them as they were the ones I played with as a kid.