Yes! [If the energy of his voice doesn't give it away, the energy of his nod surely does - Papyrus has been at this a while, and without enough sleep. It doesn't impede his cheer as he continues:]

I'm going to make something to bring to a party. But I thought, why just make something, when I could make a real splash of it? So! I'm experimenting with colors.

[The first two, nearest the sink, are somewhat muddy blends of colors and beginning to melt, like they've been out of the fridge too long. The next over has three layers of distinct colors, but with a white material between the layers, interfering with how light goes through. The latest one has distinct halves of yellow and blue, with barely a hint of a green line between them. He points triumphantly at the bowl, gesturing for Sans to take a look if he hasn't already.

Energized as he is by this, though, there's something a little sidelong to his expression now. His invitation to look is something of a test, gauging what's going on. He's too familiar with Sans's careful nonchalance not to wonder whether his brother's really just visiting, or visiting but being evasive about something, or what.]