Kaffe Fassett in steel from Simply Solids
Some shot cottons keep the colours fairly similar and may have a light blue for the warp and a dark blue for the weft for example. But I love the ones which have 2 really contrasting colours, like Kaffe Fassett Shot cotton in steel which has orange and grey blue, or the Lipari collection from Oakshott Fabrics which has black thread combined with several different colours.
Lipari fabrics from Oakshott
Saints & Pinners have done a pretty good of showing the contrasting colours of their Kaffe Fasset shot cotton bundle - jewels.
Jewels bundle from Saints & Pinners
Plus this fabric from Oakshott called Chives really shows up well online, the 2 colours used are red and green.
Chives from Oakshott
The shot cotton effect seems to give the fabric more texture and makes it more interesting than just a plain fabric. If you haven't seen shot cottons before and are buying online it may be worth asking for samples before you order just so you can see the actual fabrics in person to help you decide which ones you want to go for.
My recent haul of shot cottons from Oakshott
Oakshott Fabrics - Oakshott specialise in shot cottons and have the widest range I've ever seen. You can buy them by length and in bundles. It's worth signing up to their newsletter for discount codes & free postage codes from time to time.
Simply Solids - Have several of the Kaffe Fassett shot cottons available either by length or in bundles. Most their bundles are one offs though so if you see one you like buy it quick!
Saints & Pinners - Also have the Kaffe Fassett shot cottons by length and combined into the jewels bundle as pictured above. They also have shot cottons mixed into some of their fabric bundles alongside prints too.
Truro Fabrics - Truro fabrics have some shot cotton shirting fabric to use for garment making.