Later tonight I'll try to put together some step-by-steps for that circular style one, I kind of like that one and I think it is a bit easier to do.

The basic approach will be to draw some curves, then loft them to make the main shape as a solid. Then shell to hollow it out and have some thickness to the walls, and then maybe a bit of trimming off the top to get some interesting angles and finally fillets on edges to round them all off.

- Michael