I actually use this site
https://bitcoinvanitygen.com/ and import it in my blockchain.info wallet
This is the custom address I made
.
1bL4nku3R22RgYzMLu8zssKqHwFiohXik
I don't think if this is right decision I made to make my coins secured just after I received from my imported address I eventually transfer the coins to my primary wallet. And I guess this site and there service is not recommended but its up to you to take the risks I just answered what I have experienced and what I have done.
do not use any address you got from this site. they do have your private keys and they can steal them whenever they want. there are a lot of accusations against them. you can find some of them here