Don't do this. The whole point of a salt is that it's a completely unknown, as-close-to-random string of characters as possible.
As sh1mmer said, introducing patterns or predictability into a crypto system compromises the system's security.
There are many easy ways to easily generate a "secure" salt. Eg: -Use a seeded PRNG in your language. -Read from /dev/random . -Use the ID of an object in your program/script.