Need decorating ideas on one  birthday cake for two 30 year guys. Can't figure out how to make it fit both of them. 

Any suggestions would be great. 

Thanks,

What are their hobbies?  You could start there.  That and their favorite colors or something along that line.

I'm offering you a couple of layout ideas and then a couple of decorating ideas.  Hope they inspire you to make your own design.:

 http://www.cakecentral.com/gallery/i/2221228/1322949292jpg                           http://www.cakecentral.com/gallery/i/1349755/dueo-occasion-theme            -  Use a single layer of round, oval, or hearts pushed together on one board.

        http://www.cakecentral.com/gallery/i/1362506/best-wishes   -  this could be one decorating design...........use a simular division mark where  you could pipe the b'day message, then on either side put some kind of design for ea guy w/his name.                                                                     
http://www.cakecentral.com/gallery/i/1333233/hot-dog-birthday-time                     http://www.cakecentral.com/gallery/i/1332863/chocolate-birthday-sheet 

Gerle and kakeadi, Thanks for all the suggestions, they surely helped. Hope I can decide. 

Thanks again, 

Good luck with your cake.  Be sure to post it when you've decided and it's done.  I'm sure it will be wonderful!

For #1 son when he turned 30, I did a Goodyear tire cake. Label "30 good years". He commented how I even got the tread pattern correct....lol. He is a real car guy.

For #2 sons, I have decided on the stacked dice and stacked poker chips.  He LOVES Poker.

Like a PP said, the hobbies really help define a theme. Or, the not too naughty butt cheeks in a bikini bottom. I think it is funny without being too raunchy. And expertly two "halves" to share. ;)

Many examples, of each kind of cake,  by searching the gallery here.

For #1 son when he turned 30, I did a Goodyear tire cake. Label "30 good years". He commented how I even got the tread pattern correct....lol. He is a real car guy.

For #2 sons, I have decided on the stacked dice and stacked poker chips.  He LOVES Poker.

Like a PP said, the hobbies really help define a theme. Or, the not too naughty butt cheeks in a bikini bottom. I think it is funny without being too raunchy. And expertly two "halves" to share. ;)

Many examples, of each kind of cake,  by searching the gallery here.