Use 3 toilet roll tubes for the bunny - pinch two of them into 'ear' shapes (pinch hard at one side to make the pointy tip of each ear and pinch the opposite side more gently to give a thinner curve). Use plastic-free paper tape to attach the three rolls together, so the pinched tubes sit like bunny ears atop of the circular bunny 'face'. I needed to use tape strips 1/3 and 2/3 of the way down the tubes - so they were toddler proof!
Use one toilet roll tube for the carrot - pinch it in a similar way as you shaped the bunny ears and then at the more rounded end attach a sprig of garden greenery (I used Rosemary) with paper tape. Make sure the tape is shaped to match the outline of the 'carrot' you are trying to create.
You can dip the stencils into a shallow dish of paint and/or use a paintbrush - we found it easier to apply the paint with paint brushes. Especially as the carrot requires particular colours on particular parts. Apply the paint nice and thickly so you get a clear print from your stencil.
You'll need to use coloured card to ensure the paint colours show up (or make yours a brown bunny). I got my 14cm x 14cm 'Hairy Manilla' brown greetings cards from ecocraft.co.uk - they post in plastic-free packaging (but do note that envelopes aren't included when you order the cards, you need to add them to the order separately - at the moment everyone is getting cards from us in re-used envelopes, which isn't a bad thing actually.)
Once the paint dried we added detail (heart-shaped noses, whiskers, smiles, eyes and inner ear shadows) to the bunny faces (and horizontal orange stripes to the carrots) using fine pens.
Once you have finished with your stencils, rip away any cardboard tube which has paint on and put that in your general waste bin (as painted-on card / paper cannot be recycled as the water content of the paint damages the fibres of the material). The non-painted on bits of cardboard tube can go into your kerbside recycling and your 'carrot top' greenery can be washed and added to a compost heap (if you are lucky enough to have one).
On the subject of loo roll, if you'd like to read about toilet roll alternatives (reusable loo roll) and also about traditional loo roll which can be purchased plastic-free, then please do take a look at my blog post.
Happy crafting!