Hi Daina - there are lots of options. I've used sugar cookies pulsed in a food processor, graham cracker crumbs, brown sugar (although that adds a LOT of sweetness to the slices), and/or a mixture of all of these. Hope that helps!
Hi I always use the ready to roll fondant icing and always coloured it , always after finishing a cake there was a bit left of various colours and when , even after wrapping it well , it started to drying out and cracking when rolled I used to throw it away ! Then one day i needed gravel for a Bob The Builder cake and tried to grate some fondant ! fresh fondant does not work but the dryer it is the better it is so now i keep any unused fondant any colour and use it for sand , gravel , grass or any combination of shade or colours to give different effects , its also good for covering the board , just moisten the board a little and sprinkle it around works great but you do need a ribbon around the edge of the board as it will spill off the edges .