In the front window, the single step to her window bed was an upside-down brown wicker basket that has a sturdy wooden bottom. We added a piece of non-slip shelf liner so she has good footing. To make getting down from her window bed a little easier, we added the suede ottoman as a second step.
The window looking into the back yard is another favorite napping spot. It had one ottoman that was about mid-way to the top of the cabinet. Actually, we were using the suede ottoman in the first photo. But the jump down was getting too difficult for Sammi so we looked for something that would work better. We found ottomans that were a little shorter. They were stable enough to stack two on top of each other, so using three ottomans we were able to create steps up to her bed.
We've purchased all the ottomans at Target. The're reasonably priced and they can be moved around to different locations as we need to adjust things for Sammi. To help keep them clean, I usually keep them covered with a thin towel that can be tossed in the wash.
By adding a second step we've made is safer and easier for Sammi to continue enjoying her favorite window perches.