This heart bookmark, designed by the amazing Francesco Guarnieri, is an elegant yet simple bookmark. It would make a great Valentine day's gift I am sure :) 

The design includes a whole lot of pre-creasing followed by collapsing heart into shape. Step 8 in the diagram is the most difficult step I think. But if the mountain and valley folds are followed accurately, this shouldn't be a very difficult task. 

I used 80 gsm paper with little hearts printed on it. Small sized squares work best. The 3-inch square I had used, resulted in a 1.5 inch heart, perfect for a book corner. 

Model Details:

Model: Heart Bookmark 

Creator: Francesco Guarnieri

Difficulty Level: Low Intermediate

Paper Ratio: Square

Paper Size: 3 inch squares

Model Size: ~1.5 inches across

Diagram: Origami-cdo 

The Sham, designed by Mio Tsugawa, is a ball-like modular origami made from 30 units. The modules aren't very complicated to make and the assembly is also fairly easy. The model does not require glue to hold it together, but I did add some, so that it does not fall apart easily.

My model was supposed to be done entirely in purple but then I decided to add a band of modules in another colour. I love this combination of purple and pink. I had used a rectangle of size 6 inches by 3 inches and the resulting ball measured about 12 inches in diameter, a bit too big for my liking.

A note on the paper: I have used handmade paper for this model. This is not the best paper to use, since it does not crease well or hold shapes accurately. Hence the use of glue! But origami paper in the size 4:2 inches should result in an excellent Sham.

Model Details:

Model: Sham 

Creator: Mio Tsugawa

Difficulty Level: Low Intermediate

Paper Ratio: Rectangle in ratio 1:2

Paper Size: 6 inches * 3 inches

Model Size: ~12 inches in diameter

Modules: 30

Tutorial: Youtube

Instructions: Origamio.com

A Decahedron is a solid polyhedron with ten plane surfaces. As per the wiki, there are 32300 topologically distinct decahedra!

The decahedron is yet another design from John Montroll's 'A Plethora of Polyhedra in Origami'.  The design is for a decahedron made up of 10 equilateral triangles and is of intermediate difficulty.

The paper that I have used is hand made paper with streaks of gold in it. I found the paper great for folding the model. And I like the end result as well.

Model Details:

Model: Decahedron 

Creator: John Montroll

Book: A Plethora of Polyhedra in Origami
 
Author: John Montroll
 
Difficulty Level: Low Intermediate

Paper Ratio: Square

Paper Size: 7 inch squares