If I had to pick just one dye colour from the Sonu range, and one liquid flavour additive, they would be red and scopex, respectively.

The red dye is something I use for colouring luncheon meat, which is a great summer tempter for big carp down the margins.
I also use dye to make up a red 'chummy' trail when fishing chopped worm and caster shallow. On commercial venues where there are lots of ide, this tactic can be devastatingly effective once the water warms up and fish are happy to feed shallow all day long. A good way to do it is to take an old fruit cordial bottle, thoroughly rinse it out and then squirt a couple of tablespoons of red dye into the bottle. Add a couple of squirts of Sonu black dye, then top up to the neck with water. Screw the lid on and put in your carryall.
At the water's edge I like to chop my worms in a big bait tub with a lid, add some casters, pour on some of the dye liquid, put the lid on and give it a good shake up.
Use a pole pot and drop the worm and caster mix from a  foot or so above the surface, so it goes in with a plop, then drop your shallow ring in the centre of the ripples. If ide are around the float will vanish before you can blink.
Moving on to flavours, and my out-and-out favourite is scopex. Now that Sonu does the scopex-flavoured sweetcorn, I'm spoiled really, but the liquid scopex that is in the Sonu range comes in handy if you want to give your expander pellets an added kick.
All I do is squirt a tiny amount of scopex into my pellet pump - and I mean just a couple of drops because it is potent and fish have a tremendous sense of smell, so don't overdo it.
I then add my required amount of expanders, fill the pump with water, put the lid on, give it a good shake for a few seconds, then pump the air out of the pellets. This drags the scopex flavour into the pellets' fibres, giving you and your pellets an instant edge.
For carp and skimmers, Sonu liquid scopex takes some beating. Try these ideas this spring and summer and get bagging up!