1 x 4 x 13 (23)
This 1x4x13 uses a 1x4x8 and a 1x4x5.
1 x 4 x 16 (94)
The 1x4x16 can be done in many fashions using many of the previous shapes (which explains the 94 total solutions possible). Here is an example using two 1x4x8's. The challenge would be to put the 1x4x16 together without the use of sub-shapes to make it fully interlocking.
