I went to Joann's the other day (I had coupons that were expiring so I just had to use them). I didn't find anything grey but I did find silver dust and some brushes. I had orange decorating icing already (on clearance at Target after Halloween - damn red tags get me every time). I used round fondant cutters that I already, the two smaller circles, to shape the base and top of the cake.
They turned out really crappy. I somehow got the first heart to look nice. The rest just look like blobs. Meh, I tried.
And of course, you gotta bag and tie the pops off as the finishing touch to help hide how crappy your pops really look!