Combine a grey tattoo with a colored one?

i got this beauty here: http://photos-h.ak.fbcdn.net/hphotos-ak-... and i wanna add a tattoo (this tattoo covers only the half of my arm - vertical) and i was thinking would t look nice if i would be in color? i really dont know.. or should i put suger skulls on my other arm

The link says "access denied".

sori here you got it: http://photos-h.ak.fbcdn.net/hphotos-ak-snc1/hs022.snc1/2645_1064526625161_1585871252_30166559_1479573_n.jpg