Well, since you can manipulate latex any way you want now, why not try something unusual? You've always wondered what it fells like: to be an inanimate object; to be unable to move, to speak, to breathe. Now there's a perfect opportunity to explore the world of toys... from the perspective of one.
You concentrate really hard and think: 'I want to be a balloon, I want to be a balloon, I want to be a balloon'. You're not sure how your magic works and somehow this feels like the correct way.
A wave of ripples flows through your rubber outfit. It starts to glow: first just a little bit, then more and more. Your whole body is now like a lamp, emanating soft purple light.
You float into the air, about two feet off the ground, lifted by magical force. A gust of wind makes your rubber skirt flutter and you giggle happily, seeing the first changes occur. They start with your skin: it turns dark, and then changes into shiny blue latex. You're kinda like a sexy smurf now! Then your feet become numb. You can't feel your fingers anymore: they are turned into air; same thing happens to your hands. Strands of hair are fused together and form a rubbery bob-cut now. You lick your rubber lips, awaiting the main transformation.
And so, it finally happens. A great pressure build up inside of you, unable to contain it, yo open your mouth a little and a stream of air comes out. Your limbs contract, become shorter, your features flatten out. Your lips form an inflation tube with a latex ring at the end.
'Ffffffffffffffffffffffff!'
Your whole field of vision is blue, covered by thin rubber membrane. It takes you a second to realise that you ARE this rubber membrane now.
"Ffffffffffphhfhfffffffpfpffpff'
As more air escapes, you get small enough to escape the confines of your tight-fitting dress and fly out of it, dashing all across the room, colliding with walls and furniture. Finally, there's no air left and you fall on the floor by the mirror, deflated.
As the transformation completes, the dress falls on the floor as well, the magic glow no longer holding it up.
You are now a simple round blue toy balloon, waiting to be inflated and played with.