Scrappy Irish Chains can be beautiful!
As DeborahLees mentions you would want to keep the background to the same values, likewise the chains.
Also, a good contrast between the background and chains ... otherwise it all can become mush!
Many do 9Ps alternating with plain blocks for a Single Irish Chain.
Another one that really works well as a scrappy is the Double 4P for a SIC/
Good Luck!