changeCvColor.py

import maya.cmds as mc
  
def selectPalette():
  
    selectNum = mc.palettePort(palette,q=True,scc=True)
    print selectNum
    changeCurveColor(selectNum)
  
def changeCurveColor(colorNum):
    selectNode = mc.ls(sl=True,fl=True)
    if selectNode != None:
        for node in selectNode:
            shapeNode =mc.listRelatives(node,s=True)
            if shapeNode != None:
                for shape in shapeNode:
                    if mc.objectType(shape) == "nurbsCurve":
                        mc.setAttr(shape + ".overrideEnabled",1)
                        mc.setAttr(shape + ".overrideColor",int(colorNum))
  
windowName = "changeCurveColorUI"
if mc.window(windowName,exists=True) == True:
    mc.deleteUI(windowName)
paletteWindow = mc.window(windowName,title=windowName)
paletteLayout = mc.frameLayout(labelVisible=0)
palette = mc.palettePort( dimensions=(16,2),width=16 * 20,height= 2 * 20,transparent = 0,topDown=True,colorEditable=False,cc=selectPalette)
  
for i in range(1,31):
  
    col = mc.colorIndex(i,q=True)
    mc.palettePort(palette,e=True,rgbValue=(i,col[0],col[1],col[2]))
  
mc.showWindow(paletteWindow)