How to change the colours of the interface and use high contrast themes in Windows 8

4. Select a new Windows theme from the central panel. Scroll down, and you'll find four High Contrast themes designed specifically for people with visual impairments.  

5. You can customise the themes by selecting a new desktop background colour or by changing the colours for other elements of the Windows interface. Click on Desktop Background or Colour at the bottom of the screen.

6. Click Desktop Background, and you can select a different colour by clicking on a swatch. Click Save Changes to apply it.

7. Click on Colours to customise the colour scheme. Click on the Foreground or Background colour of an item to change it, then select a colour from the Basic colours swatches or select a new custom colour by clicking on one in the palette on the right of the Colour window. Click OK to select it, and when you've finished, click Apply. 

Note: If this does not work it could be because someone else manages your computer settings (an IT department or administrator). If this is the case, you will need to contact them to access these settings or for further help.