I was just at a function on Saturday that had some similar auction items.
One that was a BIG hit--had a Sesame Street copy of Monopoly, 4-5 medium sized plush, and a Sesame St. DVD. It was really cute, and I know lots of people bid on it...it sold for more than $300.
Using the same idea you could do a Disney theme....there are Disney specific copies of some Hasbro games. I know we own Sorry that is based on the water ride in MK. I know that Toys R Us has Princess Chutes & Ladders.
If your kids are older....I think a
Lego basket would be a big hit. Around here they are crazy popular. I donated some Lego sets to our local animal shelter and they sold for more than two times the retail cost.
Or a winter outdoor basket: snowman kit, plastic snow block maker, snowball maker thing, kids set of snow shoes--things which would be fun, but you may not normally buy.
You can pretty much make any theme into a basket. Like a winter hula theme. Hot cocoa, hula hoops, grass skirts, a hula DVD
Another basket that did well had 5 or 6 $25 gift cards to a bunch of local restaurants. I think it was called "dine around town", it also sold for $300+
Hope those ideas help