I wanted to make a pendant of the square shape, but I wanted it to be bigger than what I had. The square I had so far was a bit over 2" on a side. But I found that if I turned it 45 degrees so it was a diamond and then added 2 right angle tetrahedrons on each edge I'd get a square that was almost 3" on a side, which was more like what I wanted. I also changed the arrangement of gold tubes, putting them on the inside star shape and on what used to be the outside edge, but was now an intermediate diamond.
Finally, I wanted to make a whole necklace using the square as the focal point, but I wanted to go still bigger. As I've worked out the tube lengths that I want as stock units, I've
found that lengths that approximate multiples of the square root of 2 are useful. So since my smallest length is 10mm, I'd ideally want one of 14.15xxx...mm, then 20mm then 28.3xxx...mm then 40 mm.
Obviously my tube cutting jig and ruler will only approximate that so I use 10, 14, 20, 28 and 40mm. In between those I have another series that's 12, 17, 24 and 34mm. Again in an ideal world the 2 series would fit together so that the relationship between each length and its neighbor would be the same, i.e. 12/10 would be the same as 14/12, 17/14 etc. If that were the case you could come up with a shape, and then you could scale it up or down and it would work at any place on the series, just the way that in music a melody stays the same as you move it up or down an octave ( or a fifth or whatever).
As I've said, my ratios are close, but not exact, particularly between the 2 series. So it took a fair amount of trial and error, but I finally found that if I scaled everything up 1size on my tubes except for one on the outside that I left the same, I could make a square that was the size I wanted, almost 3.5" across. Then there was a fair amount of trial and error to get a good curve that got gradually smaller so as to not be too bulky in the back, but I'm really happy with the result, and with all the steps along the way as well.