Very nice! I usually buy those premade tubes. Where do you get your supplies, do you have to have them mailed to you? Is it costly?
Well, these particular attempts were done with henna I got by trading at a Rainbow gathering, so I don't know where it came from specifically, however, I have received some henna from hennapage.com which I have yet to try out. I would say that the stuff over at hennapage.com would be of the highest quality (at least from the examples they have on the website), though you often can find henna at Asian supermarkets/specialty stores, usually between $2-5, depending on the store and where you live. Usually, the stuff sold at the stores is older and more 'stale' so it doesn't give such a great stain. As for the cones, I buy the mylar gift wrapping paper wherever I can find it.
If you're starting out, I would say go with the cheaper stuff: it's not too much of an investment if you don't like it, and the stain isn't as strong so you can henna yourself more often and practice!