Scrollers are a good idea to transform a "fire" to "water"
effect as need be with fewer fixtures. Both Fire and Water effects are called for a lot by dancers I find.
Sometimes "pin dot" stars are more desirable, other times 5-pointed starts or a mix are more called for. This can either be static or
dynamic. You can also
fade between two sets for a "twinkle". This kind of
effect is really awesome with a white
cyc and a black
scrim in front.
A "Acid trip"
effect can come in handy for some dance. Lots of funky movement with a tonne of colours. Last time I did one of these, I used a
gobo rotator and a homemade FX wheel on 4 fixtures shooting across the
cyc at two different angles, with another set of colours with just rotators at another angle.
A "Twiggy" or "forest"
effect can be very handy indeed, for dance, kids
theatre,
etc. Can be "cartooney" for dance and kids, or more realistic for more serious works.
A Snowflake
effect can be very nice for Christmas time if you have Christmas/winter themed events.
Flat colour washes are the most flexible thing to have.
If you have all of those, you'll have most possible bases covered.
Seems sufficient to me, if those could all be done. Then if you needed something else for a particular show you can always re-purpose one of them to what you need for the show at
hand without hanging new fixtures or anything.