Triangles pattern is simple and can be remembered easily. Triangles can be made bigger or smaller. The hardest part is hiding ends :)

I strongly advice you to start new skeins only from the beggining of the row. In this case your blanket will look good from sides.

Blanket consists of 180 triangles and 30 half triangles. Half triangles are needed for making rectangular form.
Joining method is row of single crochet, by you can use any other method. It is better first to join triangles into stripes and then join stripes together. In this case rows will look more straight.
You also make several rows of double crochet as blanket border.

Blanket size including crochet border is 130х220 cm, this means 12 triangles and 2 half-triangles combined in 15 stripes.

You will need equal amount of every yarn color for triangles and some extra amount of white colored yarn for joining and border. That means 500 gram of yarn of each color(or even 600 gram of white colored yarn).

I used 3.5 mm needles but I knit rather loosely.