Patrick said the wāhine was not painted to portray a certain race but to show New Zealand as "one people", while the Muslim woman symbolised the Muslim community.
"For me it was a way of combining our two cultures through art."
The painting sold and the money was donated, but then the orders started coming in.
"People were asking if they could buy a print, or if I could put the image on a T-shirt," Patrick said.
"To say I've been busy is an understatement. I've been packaging and posting with a few moments of sleep in between."
To date, $10,000 has been raised from the venture and donated to Christchurch victims through the Victim Support Givealittle page.
Patrick's printed T-shirts are being sold in Australia as well as New Zealand, including a significant number to people who took part in a mass haka in Perth today.
"I have to admit the response from the public has been a shock. But it is awesome and I am so proud to be able to say I'm a New Zealander.
"While I understand the money raised will not give back what has been taken away from the victims, it feels good to be able to do something."
Patrick said she hadn't given a lot of thought to what would happen next.
"I know I'll continue with my art and it'll be exciting to see where that takes me. This journey has been absolutely incredible so far, busy but incredible."