Garden soil would do, it's only to stop them from rolling and dry would be better, wet soil or compost could crack the eggs, so you may want to change the wet compost for dry. Good luck.
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Suze. 
3 THB, Sammy, Jemima, & Phoebe
7 Marginated, Tabitha, Ptolome, Tatiana, Noah,Lottey, Lulu & Poppy
1 TGG (Emma) RIP Feb 2012
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