I have seen some of the collage quilts quilted in an all over 1/2” grid and it looked great (walking foot used)
These Laura Heine ones
https://www.fiberworks-heine.com/sho...e-Patterns.htm
Here is a quote from the FAQs on her site concerning the thread she uses, that might interest you.
“Tips for Quilting a Collage Quilt Using your Machine:
First try heating up the area you are woking on using a hot iron with steam (you cannot overheat Steam a Seam 2). Second, use a nonstick needle; we have nonstick needles in both 90 and 100 in size here in our shop or on our web stie. Thrid, make sure you are using a good long stapled thread such as the Signature 100% cotton thread - again sold in our shop and on our web site.
Using a Long Arm:
Follow the same tips as a machine but you will want to use a MR5 needle.
Last but not least: Laura likes to use the Signature variegated thread using a cross hatch pattern to add more interest to her collage quilts! She also prefers the Quilters Dream Cotton (100% cotton) N3 - thickness. We sell this product in the store, either by the yard or prepackaged sizes, but not on our website. If you cannot find it elsewhere and you would like some please give us a call.”