Among easy Hanayamas I have Bike, Flag, Loop, Cricket, Disk, Horse, Plate, Violin, Cage, Cuby, Dolce, S&S, Star, W-U. My favorites are Loop, Disk, Horse, Violin, Dolce, S&S, Star. The Cricket and W-U are thinner and "cheesier" feeling. Cast Star can be surprisingly hard. I also have the entire marine series which is quite nice (especially in the large size). My kids (10 and 12) play with all these and they like the theme in the marine series. The harder Hanayamas are too frustrating for them.
I also got interested in sphere puzzles when my kids got a puzzle similar to Lonpos. It is very similar and called "Kanoodle". Then I bought 300 wooden spheres and drove my wife nuts gluing them together. Now I print them out using 3D printing technology at
Shapeways.