How do I spawn a random sprite out of a set of sprites?

Hi, I've recently been trying families in C2 and I found out you can't edit them during runtime which is bad considering what I'm trying to achieve.

Basically, I've 16 sprites (4 shapes, 4 colors) and I want to determine which ones to pick on spawn Family.

The 1st shape in its 4 colors is unlocked so the player can play the levels, the other 3 shapes will probably be an IAP.

The level itself determines which colors to spawn according to the colors of the exits.

So for example in level 1 I want Yellow and Blue to spawn so that becomes 8 sprites but if the player hadn't bought the rest of the shapes it'll only be 2 sprites.

Sorry if I make it look confusing if it's not already is.

You can create several families with different combinations of sprites and use them for spawning.

E.g.: SpritesFree, SpritesFreePlusPaid1, SpritesFreePlusPaid2, SpritesAll

Then when you need to spawn a new object, select one of the families depending on which one the player has bought.

Or since you only have 16 sprites, you can write a simple event like this:

r=floor(random(16))
If r=0 Spawn sprite0
If r=1 Spawn sprite1
....
If r=7 & <player purchased this sprite type> Spawn sprite7
If r=8 & <player purchased this sprite type> Spawn sprite8
...
[/code:36pikpn9]

dop2000 but that'd still spawn different colors than the ones needed for the levels or it would not spawn anything in case of r={7,8,etc.}

This is what I've reached so far for color Blue (They're currently 3 shapes only)

Would this even work? Should I continue for the rest of the colors or is there a better way of doing this?

Ok, here is the modified code:

dop2000 Thanks, never used return values before but seems pretty less confusing than what I have.