Yep. It's that simple! I found this awesome glass bottle at the Dollar Tree and then went to my local craft store and bought some acrylic paint for .59! Poured some in, rotated the bottle to spread the paint, poured a little more paint in, rotated some more, and then let the excess drain back into the paint bottle so I didn't waste any!
A simple, fun and easy way to display glass--you can cluster different colored ones and even fill them with flowers and use as a centerpiece. There's all sorts of examples on Pinterest. This was the first one I made, so I don't have a lot to show yet, but I plan on making more soon!
Right now, my daughter's play area won the glass bottle for her Spring decor! I have another one--so that one is mine ;] I love inexpensive crafts like this, especially when you use neutral colors, because you can move them around your house when you are needing a change!