Eastern Red Cedar should grow well there. If you pay attention to watering, they can grow as fast as 28"/yr in good soil but 18" is more normal. Waco has several nice examples of large older Eastern Red Cedar. These trees are drought resistant but can handle wetter years. Arizona Cypress is another conifer that should grow well if you have good drainage. They look similar to ERC but have thicker foliage and are gray-greenish in color. Both Killeen and Waco have several large specimens of these trees. Mine have only grown 12-16"/yr. but reports indicate they can grow faster. These trees are drought resistant. Loblolly pine only does well in a few selected spots where the soil is locally neutral to acidic. If you have a spot like that they will thrive, if not, they will turn yellow and die. Afghan Pine will grow here, but they often die after about 10 yrs or so as the climate here is too wet for them. They do much better planted in west Tx. There are no examples of large Afghan Pines that I know of here.

Probably Snow-on-the-Mountain, Eurphorbia marginata. There's also another, Snow-on-the-Prairie, that's a bit similar. Here is a link that might be useful: Snow-on-the-Mountain

Matt, My wife agrees with yours about the lack of normality. She doesn't like snakes at all, the other herps she's okay with. I think I've got my 2 yr. old son on my side. He seems to have already developed an interest in herps. But he and I have a hard time convincing her that we're normal. Thanks for your posts, always enjoy them. Evan

Thanks, day by day, for confirming the ID that some other people thought it was also! Much appreciation to all who looked at the photos.