For anyone interested in bluebonnets and wildflowers in general, you should watch "Wildflowers: Seeds of History" on the KLRU website. There's lots of fun and interesting information and discussions varying from why Texas highways are so beautiful (41:20) to natural seed banks to encouraging wildflowers on your property.
If you skip to 39:40, you can learn how to cultivate bluebonnets.
And if you want to know where to go to see bluebonnets in Texas, check out this site!
If you aren't in Texas and can't make it, here are some from my yard: