Summery accessories I've lately used a lot include a white-and-red patterened Gucci scarf and leopard ballerinas. Both are super comfy and go together well, even though it's a bit surprising that I'm using anything that has leopard print.
ps. if you are not sure whether you can mix and match two strong prints like florals and leopard, take a pic of your outfit and let your fashion eye decide. in most cases you can be surprised how good it actually looks! (and if you're not sure, let your friend decide... :)