I have a request for an LSU ice chest cake for the groom's cake. Does anyone have any ideas on how to make this? I'm thinking of maybe doing a sheet cake and putting a styrofoam ice chest on top and filling it. What do you think?

Have you looked up the sugar beer bottle cakes? Those are always beer bottles "on ice" - ice made out of sugar. Could've sworn I once saw an ice chest cake on here too - it was stacked and the top was carved out a bit...if I find it I'll post but you may want to search the gallery...try keyword bottle or beer...?

Sorry I can't be of more help! You certainly could go the styrofoam route but making it all edible would make a bigger impression on the guests. Wonder if you could make that thing out of rice krispie treats, if you dont' want that much cake...?

http://www.cakecentral.com/modules.php?name=gallery&meta=search&type=full&search=cooler
http://www.cakecentral.com/modules.php?name=gallery&meta=search&type=full&search=beer+bucket
http://www.cakecentral.com/modules.php?name=gallery&meta=search&type=full&search=ice+chest

Some of them have info on how they did it

I've never tried the RKT's but see them used quite a lot, most people basically just make the RKT recipe (some omit the butter) and mold it together into their preferred shape. You can use BC or RI under the fondant, or if you roll the fondant thick enough you may be able to skip the icing altogether.

Sorry I can't be more help! Hope at least the pics can inspire your final design!