Around level 30, you will be given the option of changing your aim. After that, the color of the aim and finally the lens color. This only works on Red Dot and Reflex sights.
yes
No, there is no thermal scope in Black Ops but there is an Infared Scope very similar but players show white and the background is blue. This scope isn't called thermal scope, but it really is, they just changed the name.
yes
You don't. The only available attachments for the G11 in Call of Duty: Black Ops are the Variable Zoom and the Low Power Scope.
if you do hardline perk you can change care packages.
any I think
you cant but you can change your clan tag from the playercard option
Yes, people just get pissed if you do though
No, you can't. You can only get the emblems when you prestige.
You cant exactly make a gun in black ops, but you can customize a gun in multiplayer create a class mode and play online (or offline) with the customized gun.
You can not quick scope in Black Ops as quick as you could in Modern Warfare 2, but it is still possible. Try no-scoping. In my opinion, it's more enjoyable.
No, there is no attachment with a scope for the crossbow. no there is no attachment to the crossbow at all.