there are "standard" colors:
red = 5
green = 25
black = 100
1's can be white or blue
500's are generally purple
But in a home game (or even in the vegas casino I'm currently working at), you can do what you want. Better to be consistent, as you say, not change the values week by week. Make sure there is a 4x or 5x step between values -- don't make one chip worth 10 and another 100. 1/5/10/25/100/500. The one exception is that you have 500s and 1000s, then 5000, 25,000, 100,000...
for tournaments, I'm a big fan of using the WSOP blinds progression, which starts at 25/50. See the faq
for pfapfap's "cheat sheet" card.
your set is a bit awkward because you have so many greens. Normally, you want about 100 of the "blinds" chips per table. If you use the greens as 25s in a tournament, 300 is far too many, and they quickly become irrelevant.
You could start with 5/10 blinds, using the reds as 5s. t1000 is 100bb to start with, so that works out with what you did before, and the greens become the "workhorse" chip in a single-table tournament.
Your set is actually broken down well for a limit game, where you can use a **** ton of one color. You could use the greens as quarters, and play something like .75/1.50 limit with 3-chip/6-chip betting. People love that. Use the reds as $5 "color" for the big stacks.
My choice would be to make it a mixed game of HORSE + 2-7td, badugi, & crazy pineapple (one orbit or a time limit on each game). Played limit, it won't be very intimidating to people just learning the games. For ante games, you could use those blues as nickles, but in mixed games I've played we just have the button ante for the table for simplicity.