Yes. If you open any conversation within Pulse SMS, you can tap the attach/paperclip icon to select an image. To select more images, simply tap the paperclip icon again and tap the other images you want to send. You can attach as many images as you want through this method.
You can also open whatever app you use for a gallery, then hit the share button there. After that, select Pulse SMS to attach and send them through the app.