In the preferences you can choose three different themes (color schemes).
Please note that setting themes does not work properly in older Android versions, so it's only possible to choose a theme in Android 3.2 (Honeycomb) and above.
These themes can be chosen to your liking. The “classical” theme is derived from the predecessor of Safenotes, Keynotes.
Althought the texts in the screenshots are in Dutch, on your phone they will be in English (see Menu Choices).