Are there any predators that don't use camouflage?
What is a predator?
As discussed in the comments by @MarchHo and @AMR, there is discrepancy between the definition of predation in the biology literature and in the every day use.
From the Oxford dictionary
predation- The preying of one animal on others; the behaviour of a predator (predator n. 2); (also occas.) an instance of this
Under this common definition, the answer is "Yes".
From wikipedia (who uses the scientific definition)
In ecosystem predation is a biological interaction where a predator (an organism that is hunting) feeds on its prey (the organism that is attacked)
Under this scientific definition, predators describe whichever organism that feed on other organism. There exist no animals that do not predate (Elysia chlorotica is a quasi exception). So, the question boils down to "Are there any animals that are not well camouflaged?" and the answer is always "Yes".
The Lilac-breasted roller (just to name a nice colorful species) is very poorly camouflaged and feeds on various insects
Zebras do not camouflage (for predation purpose) when they predate grass (grazing).
Anteater do not camouflage (for predation purpose) when they predate ants
The Mandarinfish is also poorly camouflaged and predates on harpacticoid copepods, polychaete worms, small gastropods, gammaridean amphipods, fish eggs and ostracods.
As @AMR suggested in the comments, humans are poorly camouflaged too.