I used Wilton's Gel Icing Color (you can get it at Michaels, AC Moore, Joann Fabrics etc). I made the batter and then used a toothpick to add a little bit of the gel (and mixed) until I got the color I wanted. Then baked them!
I made white cake cupcakes and tinted the batter pink.
I used foil liners so people couldn't see the top and I iced with TONS on white icing and Christmas sprinkles since I told just before Christmas break.
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You could bake a simple white cupcake and make a delicious colored cream and then use a syringe to inject them. That's what they do on cupcake wars. I think they cut out just a bit of the middle of the cupcake and then frost the top. Good luck with whatever you decide!
I work at Michaels and we sell this awesome thing just for decorating cupcakes by Wilton. Its the called the 12 piece Cupcake decorating set. It has a filling tip and you will just need to get a coupler for it. To tint the frosting, there are wilton gels that you can add to white frosting. If you need anymore help you can PM me. I took all the classes on cake decorating (I had to). Good luck!
Re: Cupcake/gender ?
I used Wilton's Gel Icing Color (you can get it at Michaels, AC Moore, Joann Fabrics etc). I made the batter and then used a toothpick to add a little bit of the gel (and mixed) until I got the color I wanted. Then baked them!
https://www.wilton.com/store/site/product.cfm?id=3e30b2d9-475a-bac0-5d5c3db846dfd354
My MARRIED Bio
Yup... here are some pics (there is pink and blue b/c I made them before my appointment so I could just frost the right one and share with my ILs)
HTH
Edit: for size
My MARRIED Bio
I made white cake cupcakes and tinted the batter pink.
I used foil liners so people couldn't see the top and I iced with TONS on white icing and Christmas sprinkles since I told just before Christmas break.
I lost my angels 07/2010, 04/2017, 10/2017
Meimsx no more