Here are some presents that found their way to Nix's house separately from any given publically.
This one is, really, closer to a toy one, though Greg thoughtfully removed a few of the more childish elements. (Lizzie is probably not too impressed about being the new owner of a CSI nametag.)
This kit, however, is more or less the real thing. The accompanying note says, "NO PRESSURE :P" only the :P is, you know, not sideways. Since Greg drew it, instead of typing it.