I've made some new versions, let me explain them:
#140 is like
#127, but without the ring
#141 -
#143 - like
#126 but on a rectangular structure, with color variations; in addition, with a small 3 added
#144,
#145 - two different rectangular structures, with blue C inserted on top
#146 -
#148 - again, like
#126 on a rectangular structure, with color variations
#149 - another type of C on rectangular structure
#150 - slightly improved version of
#149 - rounded corners for "top floor" C; added 3
#151 - like
#81, with 3 raised up like in
#96#152 - same elements, but different composition