http://woodenthimble.com/freepat04.html
this is a nice simple but interesting block and the triangles have already been cut for you. how great is that.
following the basic instructions, make it up to the size of your pieces. draw your pieces the current size on paper. using those as templates, arrange them accordingly. cut whatever additional ones you need. maybe the white ones. those become the pattern pieces. your block will be it's own size, depending on the size of the pieces you have that are already cut out.
wow! that was a mouthful of garble. just follow the picture. you'll have to cut the white ones out the same size as the triangles you have and some for rectangles. you can also use the rectangles you already have in other blocks to mix'n'match. follow the picture. the block will be the size it wants to be. as long as they're all the same size it doesn't matter.