To prepare the graphics I downloaded the TTF font "Invaders from space"
from the site dafonts.com.
After you have installed the fonts I open CorelDRAW
and I placed the aliens, spaceships, and more in the size of my tie.
Since the tie had a texture squares I decided to create the pixel graphics.
From the original (a)
I created a grid (b)
and I made a boolean operation to get what I wanted (c)
You can download in EPS this result.