The one I usually take to pot lucks and that goes over well:
California Salad
1 can pineapple tidbits, drained well
1 can pears, drained well and cut in chunks
1 can mandarin orange segments, drained well
1 pkg mini marshmallows
1 pkg shredded coconut
1 container sour cream
Mix all together, refrigerate, serve!
Everyone always loves this.