Use PixelNEO's 3D Tools to construct simple three-dimensional objects. Objects made with these tools can be rotated in three dimensions and moved prior to final placement on your picture. Clicking the small arrow next to the tool's icon will display a menu containing the sub-tools below:

The Fill Selector and Color Palette can be used to change the border/line color, interior fill color and the fill method (solid color, gradient, image tile, pattern, etc.).