hmmmm
you MIGHT be able to find brown playdough, or a recipe for playdough that you could dye brown.

Or

try mixing some chocolate pudding with extra sugar or flour or coacoa (even hot chocolate mix) until it gets about as stiff as playdough. put the mix into a plastic sandwich bag. cut off one tip of the bag. Squeeze your pasty poo through the hole onto a plate or whatever you will be presenting the gift on in a circle pattern (kinda like how you get icecream out of a soft serve machine). the rest is up to you.

if you want to make 3D card, you can try pop up 3D cards, you can search it using search engine to give you rought idea on how you can do it, some people try more complex one, but you can do it much more simple