Just as the cliff & canyon pieces have different sizes & corresponding radii, it would be cool to get a larger version of these blending pieces - that way, for larger flat Terrain, you could present a more rounded look. You might even have transitional blending pieces that merge a wide curve to a smaller one, to make some fun wavy patterns. As much as the cliffs, slopes, & rounded Terrain toys are essential to the overall 3D experience of Infinity, many aspects of the game work best on larger flat areas. Larger blending pieces would provide more variety.
On a different theming note, would still like to see a climbing pole that's included with the Rails. The current pole can't be themed, and doesn't quite synch up with the grind Rails. Imagine stacking a set of vertical Rails of candy, briar thorns, or periwinkle ice that go up & up until they level out into an upper level grind Rail maze. Fun.
From the opposite direction, it would act like regular climbing pole - the character just falls.
. It does make me think of another set of toys though - the locked cage, gate, & key pieces. Had posted earlier about different metal colors. What if they could get the same set of themes as the Rails? Imagine a candy cage, a briar cage, a locked gate of vines, or that neon Avengers theme. Imagine the keys of these different varieties that need to match up with those toys. That would be fun 