My company is a preschool called "Your First ABC's"
For the 3 pieces I had to do I kept the same color scheme (green, red, blue & light yellow) so that there would be unity between the 3.
I also rearranged the logo (basically the letter cubes) so that I could place it in different places throughout the work.
I also tried maintaing the same line pattern throughout the 3 pieces of work so that there was also unity.
I also used the same font and lettering arrangement throughout the 3 pieces of work.
Brochure:
Business Card
Letter Head