Depends on your skill, time, and supplies. EASY: You could make a flat heart. Maybe a heart shaped bowl or plate. Get a ceramics mold maker that little children often use to make hand sculptures and make a heart shape with your fingers. MEDIUM: Make a 3D Heart Make a complete heart shaped tea set. Make Bow and Arrow HARD: Make a cupid (Flat or 3D you choose)
Ellipsoid. (An oval is a 2-d shape, NOT 3-d).
cube
It is an irregular shape which has no specific name - except "banana-shaped".
Examples of 3D shapes are all around, a milk bottle, a box of matches, an egg, to name but three.
To measure a 3D box-shaped solid, you will need to measure the length, width, and height of the box. Use a ruler or measuring tape to measure each side, and then multiply the length, width, and height together to find the volume of the box. Finally, you can measure the surface area by calculating the sum of the areas of all six sides of the box.
It's a cylinder. Look at http://en.wikipedia.org/wiki/Cylinder_(geometry)
3D trapezoid
A box
A box
What is the 3d name for octagon
A 3d trapezium (not trapesium) does not have a specific name.