Tom Cairney, Mark Cullen and Will Atkinson were all in the starting line-up for last week's 2-2 draw at Wigan, with the latter two netting their first Premier League goals.
It was not enough to save the Tigers from relegation to the Championship, which has exacerbated their serious financial problems.
But, with defender Liam Cooper also breaking into the first-team squad this season, Dowie believes there are plenty of encouraging signs for next season.
"The young boys have come in and shown what they're about," said Dowie, who is expected to keep faith with the trio for tomorrow's final Premier League game at home to Liverpool.
"Probably Will Atkinson was the one that raised eyebrows but he was picked on merit. What he gives you is a youthful enthusiasm and he seems to arrive where the ball is, which is a great habit to have.
"He's got goals (on loan) at Rochdale and we were seriously lacking in goals. Mark Cullen's got goals at youth-team level. They've continued that last week and it almost brought us a very big result.
"It didn't quite happen but this is something we want to build on. There were some positive moments for the future of the club."