I tried the thumping technique with the swallowtail stamp. I think next time I would thump on more color.
Thumping
Stamp Set Swallowtail and Field Flowers Ink Crumb Cake Razzleberry Ripple Cardstock Crumb Cake Early Expresso Markers Lucky Limeade, Island Indigo, Razzleberry Ripple Accessories Razzleberry Ripple Ribbon and Spritzer.
Nana's Stampin Room 
Hi Debbie thoought it looks great what is the thumping technique. Is that when hubby gets out of hand. lol ! hugs Carolyn
I found this technique on Stampin Connection. You ink your stamp with a light color then you thump your markers like you were playing the drums on the stamp. It adds just a touch of color in places. Husband thumping is only allowed when he doesn’t like a card you have made. LOL
Gorgeous card! I just received this stamp, and I can’t wait to try it out. I just love what you’ve done with it. Thanks for sharing.
Thank you Brenda. I have had fun playing with this stamp.
I don’t think there’s a rule as to how much you have to “thump”. This is a really lovely card exactly the way you’ve done it.
Great job. I got this stamp and have yet to use it. I just may have to try the thumping on it. Thanks for the inspiration.
Beautiful card!!! I will have to give that technique a try. TFS
Just Beautiful!
~ Megin of VMG206