Greetings,,,
To be fair and nitpicky. You've got to consider taxes and cost of gels, though if you already have gels you can take that off. And you do have an option of putting a slowly revolving gel colored disc in front of the lights, thus the old Christmas tree changing color routine.
The gels will reduce the light a little, vs using leds of a certain color. But you've already found your output acceptable to you. Many ways to light the night...
How about putting a single led with the spare batteries to give the kids that show up? Everyone takes a little light home?
...or not... :-)
Keith