This is a great Rise360 example that I love.
So, I had a play and found it was way easier than I thought.
Here are my tips.
Open PowerPoint (for us that do not have an Illustrator program).
I created a solid colour filled a shape (with a straight/flat bottom) in PowerPoint. then added some graphics on top of the shape.
I selected the entire graphic and then clicked Save as a Picture.
In Rise 360 - I used an Image Full Width block and import my newly created picture.
I then added the next block, Text/Statement (what-ever you want).
I changed the background colour to the solid fill colour of the picture.
I reduced the padding between the 2 blocks to 0 (Image block, Bottom padding 0 and Text block, Top padding 0).
The Edit screen will show a white gap between but when you click Preview the gap is gone and the magic happens.
Note: I would add the screen shots or file but unable to.
I hope that helps anyone wanting to get more creative in their programs.