I'm a bigger fan of live plants myself. They look nicer, they give a stronger element of care to the aquarium, and because they have a little bit of difficulty and patience to them, there is a sense of purpose and pride when they begin to sprout additional leaves, or flowers and such.
Don't be set off by my words "difficult" and "patience." Anyone can grow a planted tank. It is just finding the right plant for you.
I highly recommend Java Fern, and Java Moss. They are very simple plants to grow, do not need to be planted INTO the substrate (ground), and do not require a high amount of light.
Re: Your betta bulbs. Just as everyone else has noted. They take a long time to start, if they decide to. The only one of 5 that I got in my starter pack took 5 weeks to pop open. When it did, it shot up like a rocket, with leaves everywhere. I would say other than my Java fern, and java moss, it is my most successful plant. It is the only plant I have that has flowers. Cool little Dr. Seuss Creature-finger flowers, with little tiny white petals. It is called an Apongeton. And it continues to flower, as it has for the last 2 months.
They're very cheap (both in cost and quality), and it doesn't hurt to throw 5 bux down so that everyone gets a couple to put in their tanks and wait patiently to see if they bloom.
Remember though... 5 weeks. Keep that in mind.