Design a new logo for UpBento

UpBento

Our company produces bento boxes for children of 3-7 y.o.

We currently have two box designs (first 4 pictues in attachment), so the logo should work well with both of these colors. However, we are thinking about adding more color variations to our designs, so the colors of the logo should look good on any box.
We'd prefer you to focus more on the text itself rather than on the images, so text is the most important part of the logo for us.
Although we would prefer the logo to concentrate on textual visualization, we are open to using physical objects or silhouettes as parts of the logo. It would be perfect if physical object shapes were used to depict some letters of the logo.
We would like the logo to be visual and stay in a close connection with our product. For example, we have an idea that the letters may resemble the shapes of the compartments of the boxes (the round compartment for o or p; or like u, b, p in the attachment). We attached examples of logo designs that we find very appealing.