To build consistency in design, we should use certain colors only. For example, the Ubuntu brand guidelines give specific design guide about 
web colour and 
Ubuntu colour palette. To simplify this color guidelines, I make a color palette, modified from the existing ones to be added in inkscape. Here is the result, compared to 'Ubuntu' color palette exist by default in inkscape (it is different with the original Ubuntu Colour palette). And the next is the how-to's step by step.
  | 
| Existing Ubuntu Colour Palette, looks different with guidelines | 
  | 
| New Ubuntu & Canonical colour palette | 
Step-by-step:
- Write the code below or download from my github here.
 
GIMP Palette
Name: Ubuntu and Canonical Colours
Columns: 3
#
  0   0   0     Black - C0 M0 Y0 K100, #000000
 51  51  51     Cool Grey - PMS Cool Grey 11, C44 M34 Y22 K78, #333333
174 167 159     Warm Grey - PMS Warm Grey 5, C0 M5 Y10 K29, #aea79f
239 239 239     Light Grey - C0 M0 Y0 K0, #efefef
255 255 255     White - C0 M0 Y0 K0, #ffffff
233  56  44     Red   - C0 M75 Y80 K13, #df382c
221  72  20     Ubuntu Orange - PMS 1665, C0 M79 Y100 K0, #DD4814
239 183  62     Yellow - C0 M23 Y74 K6, #efb73e
 56 180  74     Green - C69 M0 Y59 K29, #38b44a
 25 182 238     Blue - C89 M24 Y0 K7, #19b6ee
119  33 111     Canonical Light Aubergine - PMS 512, C60 M100 Y15 K5, #77216f
119  41  83     Canonical Aubergine - PMS 683, C26 M99 Y12 K52, #772953
 94  39  80     Canonical Dark Aubergine - PMS 511, C70 M100 Y50 K20, #5e2750
 44   0  30     Server Dark Aubergine - PMS 7449, C66 M98 Y21 K85, #2c001e
 
-  Save in /usr/share/inkscape/palettes/
 
-  Change the file permission (assumed we're in /usr/share/inkscape/palettes)
 
sudo chmod 644 UbuntuCanonical.gpl
-  Now, it is ready to use the actual and original Ubuntu and Canonical colour palette in your Inkscape. Just open your inkscape and change the colour palette in right hand side of your interface. It also work in Gimp as it originally made for Gimp.