The shading on those are really good dude, I've seen some really bad faction logos in the past but those are spot on. Kudos to you and the artist.
My plan for a full sock centres around my favourite Decepticons - I'm going to get the original G1 boxart for Mindwipe, Skywarp, Skorpinok, Skullcruncher and Cyclonus with the Decepticon logo as well... the only problem I have is deciding what to have in the background to link them all up - I was thinking purple Energon grid lines like in the G1 intro. It's going to take ages and cost a fair amount [the tattooist who's doing it reckons it'll take about 2-3 hours for each character at £50 an hour... ouch!]. I think I'm gonna sneak Kremzeek in there as well

Here's a look at a work in progress by the same tattooist;

The only thing I can fault it for is the fact that it's obviously G1, but the Megatron piece is in the newer Don Figuara comic style and the Powermaster Prime is the actual boxart, so they look kinda different. It's still awesome though.